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IMPACT OF GENOTYPES AND PARITY ON REPRODUCTIVE AND PRODUCTIVE ATTRIBUTES IN DAIRY CATTLE OF NATORE DISTRICT, BANGLADESH
By: M. Saiful Islam, Susanta Kumar Kundu
Key Words: Genotypes, parity, reproductive and productive attributes, dairy cattle, Natore.
JLES-Vol-6-No-P-91-96, December 2011
AbstractImpact of genotypes and parity on some vital reproductive and productive attributes in the local (L×L, n = 100) and four crossbred cows (L×F, L×SL, L×JR and L×S; n = 318) raised in randomly selected smallholder dairy farms scattered all over Natore District and adjacent areas have been assessed during a period from September 2007 to June 2010. With regard to reproductive attributes, significant differences existed among the cattle genotypes (P<0.05) except for gestation length (GL) and age at weaning (AW). The lowest age at puberty (AP) was found for L×F (21.42±0.37 months), while the highest for L×L (31.67±0.74 months). In terms of productivity, L×F cows produced the highest daily milk yield (DMY; 6.22±0.13 L), coupled with the highest total lactation yield (TLY; 2163.43±47.77 L), while L×L produced the lowest values (1.49±0.04 L and 416.40±12.3 L, respectively) for the traits. The effect of parity on both reproductive and productive attributes showed that the middle-aged dairy cows of the 3rd and 4th parities performed better than the younger (1st and 2nd parities) or the older (5th and beyond) ones. Considering the overall performance, the L×F cows could be ranked as the best genotype followed by their L×SL, L×JR, L×S and L×L counterparts in the study area.
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Manuscript received on 4 December 2011 and revised on 7 January 2012
M. Saiful Islam, Susanta Kumar Kundu
IMPACT OF GENOTYPES AND PARITY ON REPRODUCTIVE AND PRODUCTIVE ATTRIBUTES IN DAIRY CATTLE OF NATORE DISTRICT, BANGLADESH
JLES-Vol-6-No-P-91-96, December 2011
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